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Jack do the wires contribute to the radiation in some way in addition to the 1/2 wave elements? Are the elements driven and a reflector or a director? Is there tuning with this configuration and what about polarity? It looks horizontal.
you're looking at a representation of the electric and magnetic fields created by a quarter wave element or radiator over the first 360 degrees of one cycle of a transmitted signal. the antenna could be a vertically polarized center fed dipole or a ground plane type antenna. i can provide a link to the complete explanation located in the forum archives if you would like further detailed information.
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